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x in (-oo:+oo)
0.8 = x/3 // - x/3
0.8-(x/3) = 0
0.8-1/3*x = 0 // - 0.8
-1/3*x = -0.8 // : -1/3
x = -0.8/(-1/3)
x = 2.40000002
x = 2.40000002
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